For us, the value is not just cheap cards. It is good cards at cube scale. There is a big difference
Stack multiple copies using recursion or copy spells
The most aggressive versions of U/G Merfolk probably wouldnt want to play Seafloor Oracle, but a token version that is looking to play a longer game with Deeproot Waters and Jungleborn Pioneer could be looking toward this card for card advantage
Eventually, levelling-up enough gave me some more decks, in the form of dual-colour decks
Thats not all they do though, they also read, Whenever an Illusion you control dies, you may put a permanent card with mana value less than or equal to that creatures power from your hand onto the battlefield. This is where things get really interesting
Legendary Sorcery Color tag templates(None) Make Your Own Luck Look at the top three cards of your library